Mysql 通过在单个查询中使用多个组

我有两个查询来获取count=1和count=2的族数

SELECT Name, count(*) as c FROM Tablename GROUP BY HOUSE_NO HAVING c<=1;


 SELECT Name, count(*) as c FROM Tablename GROUP BY  HOUSE_NO HAVING c>=2 and c<=4;

请帮帮我…提前谢谢

SELECT CASE WHEN c <= 1 THEN "<=1"
            WHEN c BETWEEN 2 and 4 THEN "2-4"
       END familysize,
       COUNT(*) nooffamilies
FROM (SELECT Name, count(*) c
      FROM Tablename
      GROUP BY Name) x
GROUP BY familysize
HAVING familysize IS NOT NULL

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您需要将第一个计数放入子查询：

SELECT  COUNT(CASE WHEN C = 1 THEN 1 END) AS nooffamiliesHavingcount1,
        COUNT(CASE WHEN C = 2 THEN 1 END) AS nooffamiliesHavingcount2
FROM    (   SELECT  COUNT(*) AS C
            FROM    TableName
            GROUP BY House_No
        ) t
WHERE   c IN (1, 2);

编辑

如果您需要在您的计数范围内进行测量，您可以使用以下方法：

SELECT  COUNT(CASE WHEN C <= 1 THEN 1 END) AS nooffamiliesHavingcount1,
        COUNT(CASE WHEN C BETWEEN 2 AND 4 THEN 1 END) AS nooffamiliesHavingcount2,
        COUNT(CASE WHEN C > 4 THEN 1 END) AS nooffamiliesHavingcount3
FROM    (   SELECT  COUNT(*) AS C
            FROM    TableName
            GROUP BY House_No
        ) t

---

您需要将第一个计数放入子查询：

SELECT  COUNT(CASE WHEN C = 1 THEN 1 END) AS nooffamiliesHavingcount1,
        COUNT(CASE WHEN C = 2 THEN 1 END) AS nooffamiliesHavingcount2
FROM    (   SELECT  COUNT(*) AS C
            FROM    TableName
            GROUP BY House_No
        ) t
WHERE   c IN (1, 2);

编辑

如果您需要在您的计数范围内进行测量，您可以使用以下方法：

SELECT  COUNT(CASE WHEN C <= 1 THEN 1 END) AS nooffamiliesHavingcount1,
        COUNT(CASE WHEN C BETWEEN 2 AND 4 THEN 1 END) AS nooffamiliesHavingcount2,
        COUNT(CASE WHEN C > 4 THEN 1 END) AS nooffamiliesHavingcount3
FROM    (   SELECT  COUNT(*) AS C
            FROM    TableName
            GROUP BY House_No
        ) t

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我可以在这里指定条件吗？这是在INhere中，例如我指定了1和2。但是我有类似于=2的条件，请看我前面的问题，因为您的表中有12个不同的族，它们每个只有一行。我可以在这里指定条件吗。这是在INhere中，例如，我指定了1和2。但我有类似于=2的条件，请看我前面的问题，因为在您的表中有12个不同的族，它们每个只有一行。